1. a metal block in breech-loading firearms that is withdrawn to insert a cartridge and replaced to close the breech before firing; [syn: breechblock, breech closer]
WordNet (r) 3.0 (2006):
breech closer
n 1: a metal block in breech-loading firearms that is withdrawn
to insert a cartridge and replaced to close the breech
before firing [syn: breechblock, breech closer]